Novel energy-saving water-ring vacuum pump

The utility model relates to the technical field of pump, particularly to a novel energy-saving water-ring vacuum pump. The novel energy-saving water-ring vacuum pump is characterized by comprising a pump cover, a circular disc, a flat key, an impeller, a mechanical seal, a pump body, a motor and a flexible exhaust valve plate. In the novel energy-saving water-ring vacuum pump, the circular disc is disposed on the pump cover, and the flexible exhaust valve plate is disposed on the circular disc; when the pressure of a gas among the blades of the impeller achieves an exhaust pressure, the gas is exhausted in front of an exhaust port via the flexible exhaust valve plate, so that the power consumed due to the too high pressure of the gas is reduced, thereby reducing consumption and achieving an energy-saving effect.